I hadn't heard about this new requirement that takes effect January 1st and wanted to pass along the info. Here's a KOMO article on it: http://www.komonews.com/news/consumer/New-carbon-monoxide-alarm-requirement-on-Jan-1-182042681.html
This is info from SPD with more details: http://www.seattle.gov/fire/FMO/firecode/CAM/5121CAM%20CORequirements.pdf
Considering this takes effect in 3 weeks, I'm surprised I haven't heard about it. I suppose I need to talk to my landlord about this.